Error to transmit hexadecimal codes in instrument using matlab

Hello I have a serious problem.I want to transmit hexadecimal codes command in my instrument but , there is always error in command window like:

Warning: The specified amount of data was not returned within the Timeout period. is thre a solution please?

thanks.

My code.

obj2 = instrfind('Type', 'serial', 'Port', 'COM5', 'Tag', '');

      obj2 = serial('COM5');
  else

      fclose(obj2);

      obj2 = obj2(1);

end

set(obj2,'BaudRate',9600,'DataBits', 8, 'Parity', 'none','StopBits', 1, 'FlowControl', 'none','Terminator','CR');
set(obj2,'Timeout',0.1);
set(obj2,'OutputBufferSize',88);

% Connect to instrument object, obj1.
fopen(obj2);

txdata = ['10';'02';'00';'00';'10';'03'];
txdata_dec = hex2dec(txdata);
fwrite (obj2, txdata_dec, 'uint8');

rxdata_dec = fread(obj2);
fclose(obj2)
delete(obj2)
clear obj2

[dpb]

_set(obj2,'Timeout',0.1);)

Try increasing the timeout, maybe???